Is this common for men?

Guys is this a common thing, I was with a guy we've dates on and off but still have a pretty good connection mental and physical. I went down on him everything seemed fine. it sounds like he was enjoying it then it started getting soft. I didn't want to say anything not sure if he was embarrassed. But does this normally happen or am I not that good and need more practice?

Is this common for men?
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